Problem 3: How do the convertible and center of mass kinetic energies change in the course of a collision. for an isolated system? Select One of the Following: (a) They both stay constant throughout the collision (b) Kmm changes. but Kcm stays constant (c) KC,\" changes. but Km\of mass cannot change, so if the center of mass was moving before the collision, it must still be moving afterwards; and, as mentioned in this chapter's introduction, as long as there is motion in a system, its total kinetic energy cannot be zero. Kw; (J) 05 0.4 0.3 0.2 0.1 z (ms) Figure 4.5: The total kinetic energy as a function of time for the collisions shown in Figures 1, 3 and 4, respectively